How did hourglass happen? How did they even get the right amount/size of each sand particle/other physical aspects to be aligned with the time?
In: Physics
The hourglass didn’t just appear out of nowhere. Before that people used things like the [clepsydra](https://en.wikipedia.org/wiki/Water_clock) which was a basin of water that flowed into another one and the rate it filled was used to mark time. The hourglass is just a dry, reusable (flip it instead of refilling it) version of that.
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